Compiler Error C2939

'class' : type-class-id redefined as a local data variable

You can't use a generic or template class as a local data variable.

This error is obsolete in Visual Studio 2022 and later versions.

This error can be caused if braces are improperly matched.

The following sample generates C2939:

// C2939.cpp
template<class T>
struct TC { };
int main() {
   int TC<int>;   // C2939
   int TC;   // OK
}

C2939 can also occur when using generics:

// C2939b.cpp
// compile with: /clr
generic<class T>
ref struct GC { };

int main() {
   int GC<int>;   // C2939
   int GC;   // OK
}

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